Impact of Co Substitution at Fe Site on the
Properties of Fe0.9-xCox Zr0.1 Alloys
Ayman Sawalha
Physics Department, Faculty of Science, King Faisal University
Al-Hassa, Saudi Arabia
Q. I. Mohaidat
Physics Department, Wayne State University, USA
Abstract
The structural and Mössbauer spectroscopy of Fe0.9-xCox Zr0.1 alloys with various x values (0.00 < x < 0.10) are presented. Two different phases with different compositions are observed in the x-ray patterns for all samples. The former is α-Fe phase (BCC structure) and the latter is Zr-Fe phase (hexagonal structure). The lattice parameters are almost kept constant with increasing Co for the above two considered phases. The Mössbauer spectroscopy indicates that Fe is present in two magnetic sites and one non-magnetic site. One of the two magnetic sites is attributed to α-Fe phase in which Co is dissolved, and the second to Fe-Zr inter-metallic phase. While the non magnetic component is attributed to the γ-Fe phase. The full width at half maximum (FWHM), relative intensity, isomer shift and hyperfine fields are calculated for all samples and their values are found to be different in both components. Our results are discussed and explained in terms of the local effects, produced by Co substitution, on the hyperfine interactions of this type of alloy system.
Keywords: Fe0.9-xCox Zr0.1, Mössbauer, Hyperfine, Alloys and Isomer
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